2002 Volume 45 Issue 4 Pages 510-516
The stress field near a contact edge in fretting fatigue tests depends on the deformation type at the contact edge. During one cycle of loading in a fretting fatigue test, nine types of the stress field, among which six are independent, can possibly exist. In this study, the detailed forms of the singular stress variation range near the contact edge, i. e., the differences of singular stress fields corresponding to the maximum and the minimum loads, have been theoretically analyzed. The theoretical results were compared with numerical results obtained by the boundary element analysis. It was found that the singular order of the stress field obtained by the theoretical solution agrees well with the numerical results. It should be noted that the stress variation range presents different singular behavior for different deformation types. Therefore, the fatigue strength evaluation should be carried out in a manner corresponding to the stress variation range type. It was found that a fretting fatigue crack was initiated in the maximum shear stress range direction, and then kinked into the maximum tangential stress range direction following the initiation stage of the crack.